ci: Always upload successfully created artifacts

The `Create I artifacts` step is always run, whether earlier steps
succeeds or not.  But the upload step would only run if all preceeding
steps wer successfull.  Add a conditional to always run except if
artifact creation failed.

(backport <rust-lang#4345>)
(cherry picked from commit f10e8e4)

Author: snogge

.github/workflows/ci.yaml

@@ -123,9 +123,11 @@ jobs:
         run: ./ci/run-docker.sh ${{ matrix.target }}
 
       - name: Create CI artifacts
+        id: create_artifacts
         if: always()
         run: ./ci/create-artifacts.py
       - uses: actions/upload-artifact@v4
+        if: always() && steps.create_artifacts.outcome == 'success'
         with:
           name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}
           path: ${{ env.ARCHIVE_PATH }}
@@ -192,9 +194,11 @@ jobs:
         run: ./ci/run-docker.sh ${{ matrix.target }}
 
       - name: Create CI artifacts
+        id: create_artifacts
         if: always()
         run: ./ci/create-artifacts.py
       - uses: actions/upload-artifact@v4
+        if: always() && steps.create_artifacts.outcome == 'success'
         with:
           name: ${{ env.ARCHIVE_NAME }}-${{ matrix.target }}
           path: ${{ env.ARCHIVE_PATH }}